Brandtålighet för byggnadsmaterial

This Standard specifies a test and assessment method for determining the contribution made by fire protection systems to the fire resistance of structural steel beams, I and H sections, in the horizontal plane containing openings in the web which may affect the structural performance of the beam. It is applicable to beams subjected to 3 or 4 sided fire exposure.

For any cellular beam with a single web opening or where the web openings are considered to be of small diameter in relation to the web depth the applicability of this Standard shall be determined by a structural engineer

The Standard applies to fire protection materials that have already been tested and assessed in accordance with ISO 834-10 and ISO 834-11 and cannot be used in isolation. It covers fire protection systems that include both passive and reactive materials which follow the section profile as defined in this document.

Use of ISO 834-13 requires the multi-temperature analysis (MTA) derived from ISO 834-11 as the basis for determining the thickness of fire protection for beams with web openings. The MTA shall be carried out on the web and bottom flange separately generating an elemental multi-temperature analysis (EMTA). The bottom flange EMTA may be used as the top flange EMTA when a beam is subject to 4 sided exposure.

The standard contains the fire test methodology, which specifies the tests that shall be carried out to provide data on the thermal characteristics of the fire protection system when exposed to the standard temperature/time curve specified in ISO 834-1. It also contains the assessment, which prescribes how the analysis of the test data should be made and gives guidance on the procedures that should be undertaken.

The assessment procedure is used to establish:

a) On the basis of the temperature data derived from testing unloaded steel sections, the thermal response of the fire protection system on cellular beams, (the thermal performance).

b) The temperature ratio between the web post and the web reference temperature, which will vary depending on the web post width.

c) The temperature ratio between points around the web openings and the web reference area.

d) A structural model shall be used to derive limiting temperatures for cellular beams. These temperatures combined with b & c above will enable the determination of the correct fire protection thickness from the elemental multi temperature analysis from ISO 834-11.

e) A structural model shall be used to derive limiting temperatures for cellular beams using the data from b), c) and d) above.

This Standard specifies a test and assessment method for determining the contribution of fire protection systems to the fire resistance of circular and rectangular solid steel bar. For other section shapes such as; angles, channels and flats reference should be made to ISO 834-10 and ISO 834-11. The standard cannot be used for twisted wire and is not suitable for cold or hot rolled steel bar primarily used for the reinforcement of concrete.

The standard is applicable for the protection of solid bar up to a maximum diameter of 130 mm and in the case of rectangular bar the maxiumum side length shall be limited to 130 mm with a maximum aspect ratio of 2:1 against the shorter length side. Beyond these limits the dimensions are covered in ISO 834-10 and ISO 834-11.

The standard may be used for any applied fire protection system including multi-layered systems provided they have demonstrated their integrity/ stickability when tested on floor beams and hollow sections under load, and assessed up to the maximum protection thickness in accordance with ISO 834-11. It is applicable to reactive fire protection materials (intumescent coatings) and passive materials which include sprays, board, slabs and preformed casings which are either in intimate contact with the bar, or which include an airspace between the bar and the protection system. The method used for applying/ fixing the fire protection to solid bar should be the same as that used in the protection of the steel floor beams or hollow sections. The standard contains the fire test methodology, which specifies the tests that shall be carried out to provide data on the thermal characteristics of the fire protection system when exposed to the standard temperature/time curve specified in ISO 834-1. It also contains the assessment, which prescribes how the analysis of the test data should be made and gives guidance on the procedures by which interpolation should be undertaken. This standard does not incorporate a loaded test on a tension member.

The standard caters for testing in both the vertical and horizontal orientations at the discretion of the sponsor. Results from horizontally orientated bar may be applied to any orientaion, whilst results from vertically orientated bar shall only apply to that orientation.

The limits of applicability of the results of the assessment arising from the fire test are defined together with permitted direct application of the results to different steel types and sizes over the range of thicknesses of the applied fire protection system tested.

The assessment procedure is used to establish:

— on the basis of temperature data derived from testing steel bars, any practical constraints on the use of the fire protection system under fire test conditions, (the physical performance);

— on the basis of the temperature data derived from testing steel bars, the thermal properties of the fire protection system, (the thermal performance).

The limits of applicability of the results of the assessment arising from the fire test are defined together with permitted direct application of the results to different steel types and sizes of steel bar over the range of thicknesses of the applied fire protection system tested.

This test procedure only applies to the fire protection materials that have previously tested and assessed in accordance with ISO 834-10 and ISO 834-11.